content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.core.*;
  import io.reactivex.rxjava3.disposables.Disposable;
  import io.reactivex.rxjava3.exceptions.Exceptions;
  import io.reactivex.rxjava3.functions.Cancellable;
  import io.reactivex.rxjava3.internal.disposables.*;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  /**
   * Call a create action with an abstraction of the incoming subscriber to allow
   * thread-safe and cancellation-safe terminal event emission.
   */
  final class NonoCreate extends Nono {
  
      final CompletableOnSubscribe onCreate;
  
      NonoCreate(CompletableOnSubscribe onCreate) {
          this.onCreate = onCreate;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super Void> s) {
          NonoEmitter parent = new NonoEmitter(s);
          s.onSubscribe(parent);
  
          try {
              onCreate.subscribe(parent);
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              parent.onError(ex);
          }
      }
  
      static final class NonoEmitter extends BasicRefQueueSubscription<Void, Disposable> implements CompletableEmitter {
  
          private static final long serialVersionUID = -7351447810798891941L;
  
          final Subscriber<? super Void> downstream;
  
          NonoEmitter(Subscriber<? super Void> downstream) {
              this.downstream = downstream;
          }
  
          @Override
          public void cancel() {
              DisposableHelper.dispose(this);
          }
  
          @Override
          public void onComplete() {
              Disposable d = getAndSet(DisposableHelper.DISPOSED);
              if (d != DisposableHelper.DISPOSED) {
  
                  downstream.onComplete();
  
                  if (d != null) {
                      d.dispose();
                  }
              }
          }
  
          @Override
          public void onError(Throwable t) {
              if (!tryOnError(t)) {
                  RxJavaPlugins.onError(t);
              }
          }
  
          @Override
          public boolean tryOnError(Throwable t) {
              Disposable d = getAndSet(DisposableHelper.DISPOSED);
              if (d != DisposableHelper.DISPOSED) {
                  downstream.onError(t);
  
                  if (d != null) {
                      d.dispose();
                  }
                  return true;
              }
              return false;
          }
  
          @Override
          public void setDisposable(Disposable d) {
              DisposableHelper.set(this, d);
          }
  
          @Override
          public void setCancellable(Cancellable c) {
              setDisposable(new CancellableDisposable(c));
          }
  
          @Override
          public boolean isDisposed() {
              return DisposableHelper.isDisposed(get());
          }
      }
  }
  